Replying to 05 Subaru WRX

Right now I drive a lame 87 honda prelude, yet it only has like 96k miles and the interior is plush, although its time to move on an upgrade.

My Uncle is selling an 05 sub, wrx, with 87k miles, manual tran, 5 speed, its clean aka stock except upgraded exhaust. My question is would it be worth paying low 9s for this car?. I want it to be fast, but I dont wanna look like a jackass having a wrx and not an sti...

What mods could I do to make it faster? thanks for serious feeback

inb4 flames add 5 hp.